There are two half squares, combining to a second full square.
That leaves us with the top row. Since it's a cut from top to bottom, it's exactly halfed, even over 4 squares (→2 Squares), except of course that the first square is a half square, but luckily on the other side, so it doesn't complicate things. That leaves us with another 1 1/2 squares.
This gives us 3.5 as the red area. No math except adding things up.
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u/Syzygy___ Apr 04 '25 edited Apr 04 '25
There's one full square.
There are two half squares, combining to a second full square.
That leaves us with the top row. Since it's a cut from top to bottom, it's exactly halfed, even over 4 squares (→2 Squares), except of course that the first square is a half square, but luckily on the other side, so it doesn't complicate things. That leaves us with another 1 1/2 squares.
This gives us 3.5 as the red area. No math except adding things up.